Live flood monitor

Real-time river flooding
across America.

Live USGS streamgauge readings, FEMA flood zones, NWS flood watches and warnings, and historical context — one map, refreshed throughout the day. Built for flood researchers, emergency managers, and outdoor recreationists.

Last updated June 4, 2026 · 57 sensors live
Rivers above flood
17
Watersheds elevated
41
Active flood sensors
57
USGS gauges tracked
10K+
Layers
Flow vs. normal
< 50%
~ 100%
200%
500%+
Tiles © Mapbox · Data USGS, NOAA NWS, FEMA, NRCS · Click any feature for details · Multiple layers under your click aggregate into one popup.
Today's flood briefing

What's happening right now

An AI-generated daily summary stitched from active streamgauge readings, NWS warnings, and watershed status.

June
4
2026
Flood report
# CATASTROPHIC FLOODING STRIKES MULTIPLE STATES AS STREAMFLOWS SURGE TO DANGEROUS LEVELS

**URGENT FLOOD EMERGENCY ALERT:** Multiple regions across the United States are experiencing life-threatening flooding conditions as streamflows skyrocket to unprecedented levels, with some areas seeing water flows more than 690 times above normal. Texas communities are facing particularly catastrophic conditions, while the Southeast, Midwest, and Gulf Coast regions are also experiencing dangerous flooding. These extreme conditions coincide with the start of the 2026 Atlantic hurricane season, compounding concerns as officials urge residents to prepare for additional storm threats and tropical moisture that could worsen already dire situations.

Texas is facing the most extreme flooding crisis, with communities near Houston experiencing apocalyptic water levels. The Spring area north of Houston has streamflows at 2,084% of normal, while the Lower West Fork Trinity region near Fort Worth has exploded to an unimaginable 28,336% of normal flow—representing a surge from just 3.6 cubic feet per second to 1,030 cfs. The Lampasas River area has reached 14,155% of normal, and the San Gabriel River region northeast of Austin is at 12,365% of normal. These extraordinary conditions threaten widespread infrastructure damage, road closures, and potential evacuations in the Dallas-Fort Worth and Houston metropolitan areas. The Lower Guadalupe River near Victoria has reached 68,462% of normal flow, creating extreme flood danger for coastal communities. This crisis comes as Texas already leads the nation in flood insurance cancellations due to rising costs, leaving many residents financially vulnerable.

The Southeast is simultaneously battling severe flooding, with the Alapaha River near Valdosta, Georgia, at 6,377% of normal and the Ohoopee River near Swainsboro at 1,570% of normal. Alabama faces critical conditions as the Tombigbee River system around Demopolis and surrounding areas runs at nearly 300% of normal, with flows reaching 62,900 cfs compared to the typical 21,300 cfs. The Black Warrior River near Tuscaloosa is at 427% of normal, threatening widespread damage in these communities. The Midwest is also experiencing dangerous flooding, with the Cahokia region near St. Louis at 687% of normal and North Dakota's Pembina River area reaching 4,822% of normal. Louisiana's Bayou Bartholomew and Saline Bayou regions are experiencing flows at 784% and 687% of normal respectively. As tropical moisture continues to threaten the Gulf Coast and forecasters warn of additional storm systems, residents in affected areas should evacuate if ordered, avoid flooded roadways, and monitor local emergency management updates continuously.
Right now

Rivers currently flooding or rising

Live USGS streamgauge readings aggregated by river. Percent-of-normal compares current flow to the seasonal average.

River Observed (cfs) Seasonal avg (cfs) vs. Normal
Ohoopee River 2,700 172 ↑ 1570% of normal
Forest River 1,990 115 ↑ 1730% of normal
Black Warrior River 18,600 4,360 ↑ 427% of normal
Nueces River 1,250 46 ↑ 2712% of normal
Little Cottonwood Creek 44 227 19% of normal
Wild Rice River 182 310 59% of normal
Tygart Valley River 5,040 760 ↑ 663% of normal
Neosho River 502 23 ↑ 2231% of normal
Gila River 176 24 ↑ 733% of normal
Chattahoochee River 4,170 636 ↑ 656% of normal
Delaware River 1,790 189 ↑ 950% of normal
Cedar River 84 228 37% of normal
Lampasas River 1,550 11 ↑ 14155% of normal
Alapaha River 1,320 21 ↑ 6377% of normal
Samish River 43 103 41% of normal
Tombigbee River 78,890 26,710 ↑ 295% of normal
Pecos River 395 36 ↑ 1097% of normal
By basin

Watersheds running elevated

Aggregated by HUC8 watershed code. Useful for catchment-level flood-risk assessment.

HUC8 code Watershed Observed (cfs) vs. Normal
h03160106 Middle Tombigbee-Lubbub 15,990 ↑ 296%
h07140101 Cahokia-Joachim 4,340 ↑ 687%
h17110002 Strait Of Georgia 43 41%
h12100402 West Matagorda Bay 159 ↑ 4321%
h03110202 Alapaha 1,320 ↑ 6377%
h13070001 Lower Pecos-Red Bluff Reservoir 395 ↑ 1097%
h03160109 Mulberry 2,727 ↑ 720%
h12040104 Buffalo-San Jacinto 3,683 ↑ 1455%
h12040102 Spring 371 ↑ 2084%
h16020204 Jordan 44 19%
h11140302 Lower Sulphur 398 ↑ 619%
h08040205 Bayou Bartholomew 216 ↑ 784%
h11140208 Saline Bayou 211 ↑ 687%
h03170001 Chunky-Okatibbee 1,220 ↑ 996%
h03070107 Ohoopee 2,700 ↑ 1570%
h09020313 Pembina 569 ↑ 4822%
h11030014 North Fork Ninnescah 623 ↑ 656%
h12030102 Lower West Fork Trinity 1,030 ↑ 28336%
h15040002 Upper Gila-Mangas 176 ↑ 733%
h11080008 Revuelto 1,320 ↑ 69110%
h03080103 Lower St. Johns 38,298 26%
h03160204 Mobile - Tensaw 619 ↑ 617%
h07110006 South Fork Salt 168 ↑ 764%
h03160201 Middle Tombigbee-Chickasaw 62,900 ↑ 295%
h10270103 Delaware 1,790 ↑ 950%
h15010015 Las Vegas Wash 212 ↑ 636%
h03160113 Lower Black Warrior 18,600 ↑ 427%
h05020001 Tygart Valley 10,460 ↑ 728%
h12100204 Lower Guadalupe 178 ↑ 68462%
h11070201 Neosho Headwaters 502 ↑ 2231%
h17110012 Lake Washington 34 54%
h09020105 Western Wild Rice 182 59%
h09020308 Forest 1,990 ↑ 1730%
h12070205 San Gabriel 2,865 ↑ 12365%
h18070105 Los Angeles 206 ↑ 16480%
h07120004 Des Plaines 213 52%
h12070203 Lampasas 1,550 ↑ 14155%
h03130009 Ichawaynochaway 530 ↑ 1371%
h05040001 Tuscarawas 486 ↑ 862%
h12110105 Middle Nueces 1,250 ↑ 2712%
h03130001 Upper Chattahoochee 4,170 ↑ 656%
Background

What causes river flooding

Flooding is rarely a single-cause event — multiple factors usually compound. The most common drivers across the U.S.

🌧

Heavy rainfall

Persistent rain saturates soils and overwhelms drainage networks. Tropical systems and atmospheric rivers are the worst culprits.

Rapid snowmelt

Spring melt pulses can deliver months of accumulated water in days — especially when warm rain falls on existing snowpack.

🧊

Ice jams

Breakup ice can block channels, forcing water to back up and inundate upstream banks. Common on northern rivers in early spring.

🌊

Storm surge

Coastal hurricanes push seawater inland. Surge combined with rainfall is the deadliest flood scenario in U.S. history.

🛡

Reservoir releases

Controlled dam releases can dramatically increase downstream flow. USACE and USBR publish release schedules, but conditions change fast.

🌌

Burn scars

Wildfire-stripped slopes can't absorb rainfall — even modest storms produce dangerous flash floods on burned watersheds for years afterward.

Safety

Flood preparedness checklist

Floodwaters rise faster than most people expect. The basics that save lives.

1
Never drive through floodwaterSix inches can stall a car; two feet floats most vehicles. Turn around — don't drown.
2
Monitor levels near youTrack the gauges upstream of your location. Snoflo's push alerts can ping you the moment a threshold is crossed.
3
Have an evacuation planKnow two routes out and where higher ground sits. If officials issue an evacuation order, leave — don't wait.
4
Move valuables upDocuments, electronics, and sentimentals to upper floors. Disconnect electrical at the main breaker if water enters the structure.
5
Trust official sourcesNWS warnings and local emergency management are the authoritative source. Snoflo data is informational; always cross-check.
6
After the water recedesDon't return until officials clear the area. Floodwater carries sewage, fuel, and downed power. Document damage before cleanup.
Frequently asked

Flood map & river monitoring FAQ

What does "percent of normal" mean?

The current flow at a gauge compared to its seasonal average for this date. 100% means flow is right at the historical norm. 200%+ means twice the typical flow — a strong indicator of flood conditions on small-to-medium rivers.

What's the difference between a flood watch and a flood warning?

Watch: conditions are favorable for flooding within the next 12–48 hours. Warning: flooding is happening or imminent. Both come from the National Weather Service. Snoflo overlays both as toggleable layers on the map above.

How often does Snoflo's data refresh?

USGS streamgauge readings update every 15 minutes; we re-pull every hour. NWS warning polygons update as the NWS issues them — usually within 5 minutes. FEMA flood zones are static (the National Flood Hazard Layer is updated quarterly).

What is the FEMA flood zone layer?

FEMA's National Flood Hazard Layer (NFHL) shows the 1%-annual-chance ("100-year") and 0.2%-annual-chance ("500-year") floodplains. These are based on long-term hydrologic modeling, not current conditions. Useful for property risk; not a real-time signal.

Can I get an alert when my local river floods?

Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a threshold (e.g. "alert me at 20 ft stage"), and you'll get a push the moment it crosses. Free with a Snoflo account.

Is Snoflo a substitute for official warnings?

No. Snoflo is informational. For life-safety decisions always follow guidance from local emergency management, the NWS, and law enforcement.